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Anomalous Strain Rate Dependence of Tensile Elongation in Moisture-Embrittled L12 Alloys

Published online by Cambridge University Press:  21 March 2011

T. Takasugi
Affiliation:
Department of Metallurgy and Materials Science, Graduate School of Engineering, Osaka Prefecture University, Gakuen-cho 1–1, Sakai, Osaka 599–8531, Japan
Y. Kaneno
Affiliation:
Department of Metallurgy and Materials Science, Graduate School of Engineering, Osaka Prefecture University, Gakuen-cho 1–1, Sakai, Osaka 599–8531, Japan
H. Inoue
Affiliation:
Department of Metallurgy and Materials Science, Graduate School of Engineering, Osaka Prefecture University, Gakuen-cho 1–1, Sakai, Osaka 599–8531, Japan
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Abstract

The effect of strain rate on tensile ductility of moisture-embrittled L12-type Co3Ti and Ni3(Si, Ti) ordered alloys was investigated at ambient temperatures (298K∼423K) by tensile test and SEM fractography. The anomalous increase of tensile elongation and ultimate tensile stress was observed in a low strain rate region and also at high temperatures, accompanied with an increased area fraction in ductile transgranular fracture pattern. The anomalous strain rate dependence of tensile ductility was shown to become more evident with decreasing grain size. As a process counteracting to the hydrogen decomposition from moisture in air, oxidation process on the alloy surface was suggested.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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References

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Anomalous Strain Rate Dependence of Tensile Elongation in Moisture-Embrittled L12 Alloys
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